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EV Charging Circuit and Time Planner

Check configured EVSE AC current against ordinary circuit limits, then estimate charging energy and time using vehicle acceptance and efficiency.

Use this result well

Inputs that matter
EVSE model, configuration and installation manual, Configured maximum AC input (A), Manufacturer-permitted proposed breaker (A), Verified conductor and equipment protection ceiling (A), and 10 more
Output to expect
EVSE circuit current check, Charging energy and time window
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

EVSE circuit current check

Check a proposed EVSE's configured maximum AC input against an ordinary 125% continuous-load circuit design. Enter the exact manufacturer's permitted breaker and the independently verified conductor/protection ceiling. This mode does not design an energy-management system or apply a 100%-rated exception.

Required ordinary-circuit rating = 1.25 × configured maximum AC input current.

Charging energy and time window

Estimate battery energy delivered during a documented single-phase charging window, using the lower of EVSE AC current and vehicle AC acceptance. Enter a power factor and overall AC-to-battery efficiency for this operating condition. This constant-power estimate is not a charge-curve simulation.

Battery kW = V × min(EVSE A, vehicle A) × PF × efficiency / 1000; hours = needed battery kWh / battery kW.

Updated: September 2026

Example Scenarios

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ Entered EVSE current limits fit

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 3.858025 hours estimated charging

FAQ

Check a proposed EVSE's configured maximum AC input against an ordinary 125% continuous-load circuit design. Enter the exact manufacturer's permitted breaker and the independently verified conductor/protection ceiling. This mode does not design an energy-management system or apply a 100%-rated exception. Estimate battery energy delivered during a documented single-phase charging window, using the lower of EVSE AC current and vehicle AC acceptance. Enter a power factor and overall AC-to-battery efficiency for this operating condition. This constant-power estimate is not a charge-curve simulation.

Use the exact equipment, dimensions, current ratings, operating conditions and applicable requirements described in the selected mode. Unknown values are not replaced by a generic wire, device count or capacity. Illustrative examples are arithmetic examples, not an approved installation.

Save planning case keeps an explicit local history entry. Copy MD retains current inputs, source notes and interpretation; Download CSV exports the current result breakdown. Export a separate copy before changing devices or clearing browser storage.

About EV Charging Circuit and Time Planner

Check a proposed EVSE's configured maximum AC input against an ordinary 125% continuous-load circuit design. Enter the exact manufacturer's permitted breaker and the independently verified conductor/protection ceiling. This mode does not design an energy-management system or apply a 100%-rated exception. Estimate battery energy delivered during a documented single-phase charging window, using the lower of EVSE AC current and vehicle AC acceptance. Enter a power factor and overall AC-to-battery efficiency for this operating condition. This constant-power estimate is not a charge-curve simulation.